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    Postoperative changes in the full-field electroretinogram following sevoflurane anaesthesia.

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    Authors
    Iohom, G
    Whyte, A
    Flynn, T
    O'Connor, G
    Shorten, G
    Affiliation
    Cork University Hospital and University College Cork, Department of Anaesthesia, and Intensive Care Medicine, Cork, Ireland. iohom@hotmail.com
    Issue Date
    2012-02-03T15:08:27Z
    MeSH
    Adult
    Anesthesia Recovery Period
    Anesthetics, Inhalation/*administration & dosage
    Chi-Square Distribution
    Electroretinography/*drug effects
    Evoked Potentials/drug effects
    Female
    Follow-Up Studies
    Humans
    Male
    Matched-Pair Analysis
    Methyl Ethers/*administration & dosage
    Middle Aged
    Nitrous Oxide/administration & dosage
    Postoperative Period
    Reaction Time/drug effects
    Recovery of Function
    Time Factors
    Visual Pathways/drug effects
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    Citation
    Eur J Anaesthesiol. 2004 Apr;21(4):272-8.
    Journal
    European journal of anaesthesiology
    URI
    http://hdl.handle.net/10147/208957
    PubMed ID
    15109189
    Abstract
    BACKGROUND AND OBJECTIVE: We tested the hypothesis that disturbances of the visual pathway persist following general anaesthesia, even after normal clinical discharge criteria have been met. METHODS: We performed full-field flash electroretinography in the right eye of 10 unpremedicated ASA I patients who underwent N2O/sevoflurane anaesthesia. Electroretinograms were recorded preoperatively, immediately after discharge from the recovery room and 2 h after discontinuation of sevoflurane. The time at which postanaesthesia discharge score first exceeded 9 was also noted. Data were analysed using paired, one-tailed Student's t-test. RESULTS: Latency of the b-wave on the photopic electroretinogram was greater at each postoperative time point (30.5 +/- 0.9 and 30 +/- 1.3 ms), compared to preoperative values (29.2 +/- 0.8 ms, P < 0.001 and P = 0.04, respectively). The A-B amplitude of the b-wave was less postoperatively (220.3 +/- 52.7 and 210.3 +/- 42.7 pV) compared to values before operation (248.1 +/- 57.6 microV, P = 0.03 and P = 0.01, respectively). Oscillatory potential latencies were greater at each postoperative time point (21.4 +/- 0.5 and 20.8 +/- 0.6 ms) compared to before operation (20.4 +/- 0.4 ms, P < 0.001 and P = 0.03, respectively). Oscillatory potential amplitudes were less at the first postoperative time point (17.5 +/- 6.1 microV), compared to preoperative values (22 +/- 6.4 microV, P = 0.04). CONCLUSIONS: Postoperative electroretinogram abnormalities are consistently present in patients who have undergone N2O/sevoflurane anaesthesia. These abnormalities persist beyond the time at which standard clinical discharge criteria have been met.
    Language
    eng
    ISSN
    0265-0215 (Print)
    0265-0215 (Linking)
    Collections
    Cork University Hospital

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